Method for producing polyethylene-based resin laminated foam sheet, polyethylene-based resin laminated foam sheet, and interleaf for glass plate using thereof

Abstract

A method for producing a polyethylene-based resin laminated foam sheet according to the present invention is a method for producing a polyethylene-based resin laminated foam sheet 1 with thickness of 0.05 to 0.5 mm in which an anti-static layer is adhered by lamination on at least one surface of the foam layer, including: a step of performing coextrusion and foaming of a laminate which is obtained by combining and laminating, in a die 10, a melt resin composition 6 for forming a foam layer obtained by kneading a low density polyethylene A and a physical foaming agent and a melt resin composition 9 for forming an anti-static layer obtained by kneading a low density polyethylene B and an anti-static agent, wherein the anti-static agent is a polymeric anti-static agent C which has a melting point to allow a melting point difference in the range of from −10° C. to +10° C. compared to that of the low density polyethylene B and has a melt flow rate of 10 g / 10 minutes or more.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for producing a novel polyethylene-based resin laminated foam sheet, a novel polyethylene-based resin laminated foam sheet, and an interleaf for glass plate using thereof.BACKGROUND ART[0002]Owing to sufficient flexibility and buffering property, a polyethylene-based resin laminated foam sheet (hereinbelow, also referred to as a foam sheet) can prevent a damage or a scratch of a packaged material, and thus it is widely used as a material for packaging home appliances, glass instruments, ceramic wares, or the like.[0003]Furthermore, in accordance with a development of a thin type television and an increasing demand therefor in recent years, a polyethylene-based resin laminated foam sheet having an anti-static layer is used as an interleaf disposed between glass plates to prevent a damage on a surface of glass plate during packaging or conveying of a glass plate for an image display device such as liquid display, plasma di...

AI Technical Summary

Benefits of technology

[0020]According to the production method of the present invention, it is possible to obtain a polyethylene-based resin laminated foam sheet which has high quality with prevented and suppressed occurrence of a small hole or a through hole even under continuous production over short-term period like several hours or medium- to long-term production like several days, and exhibits an excellent anti-static performance with very low thickness.

[0021]Furthermore, the novel polyethylene-based resin laminated foam sheet according to the present invention has, in spite of very low thickness, high quality with prevented and suppressed occurrence of a small hole or a through hole and it also exhibits a sufficient anti-static performance.

[0022]Therefore, it is expected that, in the field in which an anti-static function is strongly required, there would be a high demand for the novel polyethylene-based resin laminated foam sheet according to the present invention particularly as an interleaf for a glass plate for preventing a damage which occurs during packaging or conveying of thin type glass plate for an image display device such as liquid display, plasma display, or electroluminescence display.

[0023]Furthermore, the novel polyethylene-based resin laminated foam sheet of the present invention can be produced continuously over medium- to long-term period, and thus it is a foam sheet with very high industrial production efficiency.

Problems solved by technology

If a conventional thick foam sheet with thickness of 1 mm to 2 mm is used as an interleaf of such thin glass plate, not only the loading efficiency is lowered but also the thickness of the interleaf becomes excessively thick relative to glass plate, and thus there is also a possibility of having breakage of a glass plate depending on the mode for load application.

However, a problem occurs in that, when it is tried to produce a foam sheet with low thickness, it is easy to have a small hole or a through hole occurred in the foam sheet.

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